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4610X-101-510LF Datasheet(PDF) 7 Page - Cirrus Logic |
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4610X-101-510LF Datasheet(HTML) 7 Page - Cirrus Logic |
7 / 10 page ![]() EK76 EK76U Rev A 7 CURRENT SENSE The optional current sense gain and offset circuit is designed to interface with various ADCs in closed- loop current/torque control. Follow the below schematic and equations to determine the proper component values. After assembly of the EK76 including the above Current Sense circuit, R22 must be trimmed to reach the desired value of VOS. To do this, attach a Voltmeter to measure the voltage between pins 11 (negative) and 13 (positive) of P2. Apply the low-voltage supply VCC (+VS should NOT be active). Adjust R22 until the desired value for VOS is shown on the Voltmeter. The following equation represents the Low-Side Phase Current (IPHASE) as a function of voltage measured at IM_X (VM): Value Applicable Designators on EVAL94 Equation Default Value Units Suggested Tolerance VOS Bias ADC min input (or higher) 1.65 V - VOUT_MAX - ADC max input (or lower) 3.3 V - IOUT_MAX - < 80 A 33 A - Gain - (VOUT_MAX-VOS) / (IOUT_MAX* 10 mΩ) 5 V/V - RF R9, 12, 13, 16, 17, 20 1.8k < RF < 100k 50k Ω 0.1% RIN R10, 11, 14, 15, 18, 19 RF / Gain 10k Ω 0.1% RT R22 (potentiometer) 1k < RT < 100k 10k Ω - RL R21 Roughly RT ((VCC/2VOS) – 1) 39k Ω - C4 C4 C4 = 100n 100n F X7R fFIL - Typically 200k < fFIL < 1M ∞ Hz - RFIL R23, 24, 25 Typically 100 < RFIL < 1k 0 Ω - CFIL C1, 2, 3 1 / (2π * fFIL * RFIL) 0 F - R1-3 10 RIN RIN + - RF RF BIAS RFIL CFIL IM_X PGND_X 3X + - 1X BIAS RL RT VCC C4 PGND DGND DGND Phase Current IPHASE VM VOS – Gain 0.01 --------------------------------- = |
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